In FreeBSD 12.1-STABLE before r354734, 12.1-RELEASE before 12.1-RELEASE-p2, 12.0-RELEASE before 12.0-RELEASE-p13, 11.3-STABLE before r354735, and 11.3-RELEASE before 11.3-RELEASE-p6, due to incorrect initialization of a stack data structure, core dump files may contain up to 20 bytes of kernel data previously stored on the stack.
Weakness
The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Freebsd | Freebsd | 11.3 (including) | 11.3 (including) |
| Freebsd | Freebsd | 11.3-p1 (including) | 11.3-p1 (including) |
| Freebsd | Freebsd | 11.3-p2 (including) | 11.3-p2 (including) |
| Freebsd | Freebsd | 11.3-p3 (including) | 11.3-p3 (including) |
| Freebsd | Freebsd | 11.3-p4 (including) | 11.3-p4 (including) |
| Freebsd | Freebsd | 11.3-p5 (including) | 11.3-p5 (including) |
| Freebsd | Freebsd | 12.0 (including) | 12.0 (including) |
| Freebsd | Freebsd | 12.0-p1 (including) | 12.0-p1 (including) |
| Freebsd | Freebsd | 12.0-p10 (including) | 12.0-p10 (including) |
| Freebsd | Freebsd | 12.0-p11 (including) | 12.0-p11 (including) |
| Freebsd | Freebsd | 12.0-p12 (including) | 12.0-p12 (including) |
| Freebsd | Freebsd | 12.0-p2 (including) | 12.0-p2 (including) |
| Freebsd | Freebsd | 12.0-p3 (including) | 12.0-p3 (including) |
| Freebsd | Freebsd | 12.0-p4 (including) | 12.0-p4 (including) |
| Freebsd | Freebsd | 12.0-p6 (including) | 12.0-p6 (including) |
| Freebsd | Freebsd | 12.0-p7 (including) | 12.0-p7 (including) |
| Freebsd | Freebsd | 12.0-p8 (including) | 12.0-p8 (including) |
| Freebsd | Freebsd | 12.0-p9 (including) | 12.0-p9 (including) |
| Freebsd | Freebsd | 12.1 (including) | 12.1 (including) |
| Freebsd | Freebsd | 12.1-p1 (including) | 12.1-p1 (including) |
Potential Mitigations
- Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- For example, in Java, if the programmer does not explicitly initialize a variable, then the code could produce a compile-time error (if the variable is local) or automatically initialize the variable to the default value for the variable’s type. In Perl, if explicit initialization is not performed, then a default value of undef is assigned, which is interpreted as 0, false, or an equivalent value depending on the context in which the variable is accessed.